An example of a purine is
A)thymine.
B)guanine.
C)acridine.
D)cytosine.
E)uracil.

Question

Quizplus · Accepted Answer

Purines are a family of nitrogenous bases that have a double-ring structure. Adenine and guanine are both purines, while thymine, cytosine, and uracil are pyrimidines, which have a single-ring structure. Acridine is not a nitrogenous base at all, but rather a polycyclic aromatic hydrocarbon. Therefore, the best choice for an example of a purine is guanine (choice B).

An Example of a Purine Is